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[46.22.139.17]) by mx.google.com with ESMTPS id r20si10292216ejs.243.2019.06.04.04.05.15 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 04 Jun 2019 04:05:15 -0700 (PDT) Received-SPF: pass (google.com: domain of mgorman@techsingularity.net designates 46.22.139.17 as permitted sender) client-ip=46.22.139.17; Authentication-Results: mx.google.com; spf=pass (google.com: domain of mgorman@techsingularity.net designates 46.22.139.17 as permitted sender) smtp.mailfrom=mgorman@techsingularity.net Received: from mail.blacknight.com (pemlinmail03.blacknight.ie [81.17.254.16]) by outbound-smtp12.blacknight.com (Postfix) with ESMTPS id 124721C3DF5 for ; Tue, 4 Jun 2019 12:05:15 +0100 (IST) Received: (qmail 18929 invoked from network); 4 Jun 2019 11:05:15 -0000 Received: from unknown (HELO techsingularity.net) (mgorman@techsingularity.net@[37.228.225.79]) by 81.17.254.9 with ESMTPSA (AES256-SHA encrypted, authenticated); 4 Jun 2019 11:05:14 -0000 Date: Tue, 4 Jun 2019 12:05:10 +0100 From: Mel Gorman To: Andrew Morton Cc: bugzilla-daemon@bugzilla.kernel.org, linux-mm@kvack.org, gabriele balducci Subject: Re: [Bug 203715] New: BUG: unable to handle kernel NULL pointer dereference under stress (possibly related to https://lkml.org/lkml/2019/5/24/292 ?) Message-ID: <20190604110510.GA4626@techsingularity.net> References: <20190529160423.57c5a79115f350c3ebf025f9@linux-foundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-15 Content-Disposition: inline In-Reply-To: <20190529160423.57c5a79115f350c3ebf025f9@linux-foundation.org> User-Agent: Mutt/1.10.1 (2018-07-13) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, May 29, 2019 at 04:04:23PM -0700, Andrew Morton wrote: > > > (switched to email. Please respond via emailed reply-to-all, not via the > bugzilla web interface). > > Mel, we may have a regression from e332f741a8dd1 ("mm, compaction: be > selective about what pageblocks to clear skip hints"). The crash sure > looks like the one which 60fce36afa9c77c7 ("mm/compaction.c: correct > zone boundary handling when isolating pages from a pageblock") fixed, > but Gabriele can reproduce it with 5.1.5. I've confirmed that 5.1.5 > has 60fce36afa9c77c7. > Sorry, I was on holidays and only playing catchup now. Does this happen to trigger with 5.2-rc3? I ask because there were other fixes in there with stable cc'd that have not been picked up yet. They are a poor match for this particular bug but it would be nice to confirm. -- Mel Gorman SUSE Labs